Apple, sage and onion quinoa stuffing

Ingredients

• 120g dried quinoa (or wild rice), rinsed
• 360ml water
• 1 teaspoon oil
• 1 red onion, finely chopped
• 2 stalks celery, diced
• 1 eating apple, such as a Granny Smith, diced
• 1 clove garlic, finely chopped
• Small handful fresh sage, finely chopped, or 1 teaspoon dried sage
• Freshly ground black pepper, to taste
• 70ml reduced-salt chicken or vegetable stock
• Spray oil